Japanese Industrial Standard O-Rings are another popular classification system used around the globe. Published by the Japanese Standard Association, these o-rings are also categorized using the metric system. JIS O-Rings are used in many different fields, but typically are implemented in Japan's semiconductor, automotive and machine tool industries.

This elastomer possesses mechanical properties similar to Viton®, with the exception of its slightly lower compression set resistance. It is more suitable for sensitive applications where lighter compressive forces are applied to energize the seal. This core has a Shore A hardness of 70 but it also offers a broader operating temperature range of -80°F to +500°F. (-62°C to +260°C). For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
Unit of Measure

Type

N/A JIS Standard O-Ring

Material

N/A Silicone

Cross Section Width

N/A 0.138 in3.50 mm

Durometer

N/A 70

Inside Diameter

N/A 31.20 mm1.228 in

CSW Tolerance

N/A 0.004 in0.10 mm

ID Tolerance

N/A 0.006 in0.15 mm

JIS Number

N/A P-31.5

Warning

N/A Prop 65 Warning: This product may contain chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm.

O-Ring Industries

N/A O-rings are used in the military, automotive, aerospace and agriculture industries.